January 23, 2013 11:32 pm “Person Of Interest” Questioned in Doctor's Murder: Sources Sources said that Philadelphia Police questioned a “person of interest” in the murder of a doctor in her Center City home. NBC10’s Katy Zachry has breaking details in the case. US & World Videos 9:46 Another NJ earthquake: The Lineup 2:54 Penn leaders reiterate to pro-Palestinian protesters that they need to pack up camp 1:44 Pro-Palestinian protesters remain on UPenn's campus despite warnings to disband 1:30 Protests calling for ceasefire continue at Penn 6:33 Family affair: Former Eagle and new Eagle Jeremiah Trotter and Jeremiah Trotter Jr. speak out